I have drafted an email to my dealers shop foreman and service manager, with links to this thread and an explanation of the noise. I hope to hear their input soon.

For now, here is the video I took this morning (please excuse the expletives, at first I couldn't get the phone to stay up, and then when I started the car I saw it fall behind the engine which scared me. I turned the car off right away... Luckily it was in a spot that was easily retrievable. Also interesting is a "flash" that you see, maybe its the angel eyes?) I will record the starts every morning to monitor this.

I have drafted an email to my dealers shop foreman and service manager, with links to this thread and an explanation of the noise. I hope to hear their input soon.

For now, here is the video I took this morning (please excuse the expletives, at first I couldn't get the phone to stay up, and then when I started the car I saw it fall behind the engine which scared me. I turned the car off right away... Luckily it was in a spot that was easily retrievable. Also interesting is a "flash" that you see, maybe its the angel eyes?) I will record the starts every morning to monitor this.

I tend to disagree with this, mine is very pronounced with windows and doors closed. Only when car is on incline though and cold start. Flat surfaces its noise free. Noise is kinda scary though...thank god for the warranty, 1 more year to go before it expires.

I tend to disagree with this, mine is very pronounced with windows and doors closed. Only when car is on incline though and cold start. Flat surfaces its noise free. Noise is kinda scary though...thank god for the warranty, 1 more year to go before it expires.

I believe it. What I'm trying to say is that perhaps there would be even more accounts of the noise if most started the car with the driver's door open, windows open.

In Mike's video above it's audible, but probably wouldn't be noticed inside the cabin all closed up. More often than not my cold start resembles what's heard in Mike's video, and not the particularly loud grind in the video I posted.

I believe it. What I'm trying to say is that perhaps there would be even more accounts of the noise if most started the car with the driver's door open, windows open.

In Mike's video above it's audible, but probably wouldn't be noticed inside the cabin all closed up. More often than not my cold start resembles what's heard in Mike's video, and not the particularly loud grind in the video I posted.

Exactly... If I listen for it (and depending on how long the car has been sitting unstarted), I can hear it with the windows and doors closed. But I would only expect 1% of people to hear it in this situation unless they were specifically looking for it.

...is it just the noise at 23 seconds or does it carry through 24 and 25 seconds?

It's exactly at 24 seconds.

I also want to point out that if I drive the car and then park it. Come back 5 hours later and start it, no noise whatsoever. If I start it and hear the noise, and then restart it again, no noise at all. So it's a matter of oil not being where it's supposed to be, or some sort of pressure loss somewhere. Letting it sit for hours and hours unstarted almost guarantees I will hear it if I listen for it.

I believe it. What I'm trying to say is that perhaps there would be even more accounts of the noise if most started the car with the driver's door open, windows open.

In Mike's video above it's audible, but probably wouldn't be noticed inside the cabin all closed up. More often than not my cold start resembles what's heard in Mike's video, and not the particularly loud grind in the video I posted.

I'll try and get a video in-cabin, to further add to the Mike et al videos on the threads. This should give others a general idea of what to listen for.

I also want to point out that if I drive the car and then park it. Come back 5 hours later and start it, no noise whatsoever. If I start it and hear the noise, and then restart it again, no noise at all. So it's a matter of oil not being where it's supposed to be, or some sort of pressure loss somewhere. Letting it sit for hours and hours unstarted almost guarantees I will hear it if I listen for it.

Ah, it's the shhhh sound! I expected to hear a clank noise, which I did at 23 seconds, but by 24 you hear the shhhh.

The chain Tensioner part number : 11-31-7-839-053 they changed both tensioners. Since then I had no noise issues.

Quote:

Originally Posted by FormulaMMM

This is probably sage advice.. And I suppose it's worth considering that in a car with sensors galore, the issue doesn't trigger a check engine light. Engine runs flawlessly.

I had the car at the dealer last weekend in an attempt to get them to formally document and diagnose the issue. I reported it under warranty twice, documented with a video. So 5 cold starts later at the dealer, including a few with me on site, and no noise. Happens almost every morning, just not while at the dealer. Damn car.

They searched every BMW service database available to them in an effort to find a related bulletin, notice, something pursuant to this noise. Nothing found.

Is there any technical read up on the S65 low pressure VANOS system especially the stepper motor/actuator that is replacing the high pressure VANOS (hydraulic piston, piston bearing, helical gear) in the S85 ?

Everything I found online is for high pressurized oil VANOS which is irrelevant.
More knowledge would help categorize noise sources issues.
People have said "it's simple there is nothing to it". It does not appear that way.